<template>
	<view>
		<!-- 使用自定义的搜索组件 -->
		<my-search @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{height:wh + 'px'}" class="left-scroll-view">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>	
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{height:wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类的标题 -->
					<view class="cate-lv2-title">
						/{{item2.cat_name}}/
					</view>
					<!-- 动态渲染三级分类的数据列表 -->
					<view class="cate-lv3-list">
						<!-- 三级分类的item项 -->
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<!-- 三级分类的图片 -->
							<image :src="item3.cat_icon.replace('dev','web')" mode=""></image>
							<!-- 三级分类的文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins:[badgeMix],
		data() {
			return {
				//当前设备可用的高度
				wh:0,
				//分类列表数据
				cateList:[],
				//二级分类列表
				cateLevel2:[],
				//激活项索引值
				active:0,
				//滚动条距离顶部的距离
				scrollTop:0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			//调用获取分类列表数据的方法
			this.getCateList()
			
		},
		methods:{
			//获取分类列表的数据
			async getCateList(){
				const {data : res} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				
				//为二级分类赋值
				this.cateLevel2 = res.message[0].children
				
			},
			//切换点击激活项
			activeChanged(i){
				this.active = i
				
				//重新为二级分类赋值
				this.cateLevel2 = this.cateList[i].children
				
				//重新为滚动条赋值
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			//跳转到商品列表页面
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			//跳转到搜索页
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container {
	display: flex;
	.left-scroll-view {
		width: 120px;
	}
}
.left-scroll-view-item {
	background-color: #f7f7f7;
	line-height: 60px;
	text-align: center;
	font-size: 12px;
	&.active {
		background-color: #fff;
		position: relative;
		&::before {
			content: '';
			display: block;
			width: 3px;
			height: 30px;
			background-color: #c00000;
			position: absolute;
			top: 50%;
			left: 0;
			transform: translateY(-50%);
		}
	}
}
.cate-lv2-title {
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}
.cate-lv3-list {
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item {
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;
		
		image{
			width: 60px;
			height: 60px;
		}
		text{
			font-size: 12px;
		}
	}
}
</style>
